Question

write four important change which takes place during a chemical reaction.​

Answer 1

Answer:

Change of odor. Change of color (for example, silver to reddish-brown when iron rusts). Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat. Change of composition - paper turning to ash when burned.

Answer 2

Explanation:

1. change in odor.
2. change of colour.
3. change in temperature or energy.
4. change of composition.

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